Guys, I caught my husband peeking at a breastfeeding woman?

For context, he attends a play group with our child 1-2 times a week and has mentioned the name of one other mom a couple times, 'Beth'. I guess she had attended at the beginning of group in Fall (when he did as well) so they got to chatting eventually.
He mentioned to me once that she breastfeeds her little one at playgroup, and one time it was right next to him. I was a bit off put by it, not by her doing it at all (it's necessary!) But that he mentioned it. I honestly can't remember what I said, but tried to make it seem like it wasn't a big deal.

I recently attended a playgroup with husband, as I'm not often able to go. At the end, nearly everyone had cleared out except for Beth and one other mom. We were sitting across from Beth, when she started breastfeeding.
I was talking to the other mom and I noticed my boyfriend's eyes were lingering on Beth for a bit. Like 4-5 seconds (that I noticed, but it might have been longer). He also may have looked more than once, but I was trying to hold a conversation with the other mom until he eventually joined in After the two min feed, Beth came up to him and they started chatting and I kind of joined but was a little heartbroken. Like he had gotten something out of watching her do that. It was hard to concentrate on conversation.

Unsure if it matters. He called her a 'grandma' mom once before. Like yes, maybe she looks a bit older, but nowhere near grandma age. She isn't super attractive, which I hate to say would make this worse otherwise. I think he just called her that so I wouldn't worry about anything.

I just feel a bit silly about feeling insecure. But it seemed he was trying to catch a glimpse of nipple/breast. Is it something worth confronting over? What should I say?

They will continue to see each other weekly for now

Guys, I caught my husband peeking at a breastfeeding woman?
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